Can change conversation visibility

lib/models/advanced_group_info.dart

@@ -35,6 +35,7 @@ class AdvancedGroupInfo extends Group implements LikeElement {
     @required this.url,
     @required this.likes,
     @required this.userLike,
+    @required this.conversations,
   }) : super(
             id: id,
             name: name,

lib/models/conversation.dart

@@ -77,6 +77,8 @@ class Conversation extends SerializableElement<Conversation> {
   /// Check out whether a conversation is managed or not
   bool get isManaged => groupID != null;
 
+  bool get hasLogo => logoURL != null;
+
   Conversation.fromJson(Map<String, dynamic> map)
       : id = map["id"],
         name = map["name"],